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                [Poi2003]Smugglers                </h1>
                <p>时间限制：3s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">Byteotia 因为它丰富的金矿资源而闻名世界. 所以在和它的邻国Bitland的边界上每年都有大量的金矿交易。不幸的是由于税务的繁重，商人带着矿产穿过边境时都要交纳矿产价格的50% 作为关税。但是幸运的是，有一些炼金术士已经发明了一些方法能把某一种矿产转化成另一种。于是这样在交易时就可以先把昂贵的矿产转化成便宜的，等到带过边境以后在转换回来。但是由于这项工作费时费力，炼金术士对于每种转换都要收取相应的费用。现在有个商人想将1<i>kg</i>金子带过边境，他想知道最少的花费是多少。</span></div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">第一行仅一个数<i>n</i>表示有多少种金属矿产。1 &lt;= <i>n</i> &lt;= 5000. 接下来<i>n</i>行表示每种金属1<i>kg</i>的单价。第<i>k</i> +1行的数<i>p<sub>k</sub></i>为第<i>k</i>种金属的单价。0 &lt;= <i>p<sub>k</sub></i> &lt;= 10<sup>9</sup>. 我们假设金子的标号为1。接下来一个正数<i>m</i>表示一共有<i>m</i>种转换方式。0 &lt;= <i>m</i> &lt;= 100000. 接下来<i>m</i>行每行描述一个转换，它由三个数<i>a</i>, <i>b</i>, <i>c </i>表示把1<i>kg</i>的<i>a</i>金属转换为1<i>kg</i>的<i>b</i>金属需要<i>c</i>的代价。1 &lt;= <i>a</i>,<i>b</i> &lt;= n, 0 &lt;= <i>c</i> &lt;= 10000. 对于特定的金属对<i>a</i>和 <i>b</i> 最多只会出现一次。</span></div></p><hr/><h3>输出格式</h3><p><div><span style="font-size: medium">输出一行，表示把1<i>kg</i>的金子带过边境的最小花费。</span></div></p><hr/><h3>样例输入</h3><pre>4


200
100
40
2
6
1 2 10
1 3 5
2 1 25
3 2 10
3 4 5
4 1 50
</pre><hr/><h3>样例输出</h3><pre>60
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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